Rollup merge of rust-lang#81984 - sunfishcode:wasi-link, r=alexcrichton

Make WASI's `hard_link` behavior match other platforms.

Following rust-lang#78026, `std::fs::hard_link` on most platforms does not follow
symlinks. Change the WASI implementation to also not follow symlinks.

r? ```@alexcrichton```

library/std/src/sys/wasi/fs.rs

@@ -557,12 +557,8 @@ pub fn symlink(original: &Path, link: &Path) -> io::Result<()> {
 pub fn link(original: &Path, link: &Path) -> io::Result<()> {
     let (original, original_file) = open_parent(original)?;
     let (link, link_file) = open_parent(link)?;
-    original.link(
-        wasi::LOOKUPFLAGS_SYMLINK_FOLLOW,
-        osstr2str(original_file.as_ref())?,
-        &link,
-        osstr2str(link_file.as_ref())?,
-    )
+    // Pass 0 as the flags argument, meaning don't follow symlinks.
+    original.link(0, osstr2str(original_file.as_ref())?, &link, osstr2str(link_file.as_ref())?)
 }
 
 pub fn stat(p: &Path) -> io::Result<FileAttr> {